Rotary pump.



llt)

llii

titl

WILLEEAM BODGUE, 0F INUTILE?, NEW JERSEY.

RUTARY PUMP.

Specification of Letters Patent.

Patented Jan.. 115, 119MB.

Application tiled April 2li, 1916. Serial No. 93,262.

To all whom it may concern.'

Be it known that ll, WILLIAM BODGE, a citizen of the United States, and resident of Nutley, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Rotary Pumps, of which the following is a specification.

rlFhe invention relates to improvements in rotary pumps for the translation of fluids under pressure, and as herein described has partlcular reference to air pressure and vacuum pumps.

The objects of the invention are to provide a construction in which the sliding movement of the operative parts are comparatively limited, the frictional resistance thereof correspondingly reduced, and the wear and consequent leakage of the sliding joints materially lessened. liiurther objects include a pump construction effective for rotation in opposite directions, means adapted by the normal operation of the pump to radiate the' heat generated by the compression of the air or gas and maintain the parts in a comparatively cool condition, means for providing a variable air pressure Without interrupting the motion or changing the rotative speed of the pump, and means independent of the latters rotative direction for reversing the course of the air currents through the exterior ducts or passages.

in describing the invention in detail, reference is had to the accompanying drawings, forming a part of this specification, and wherein like characters of reference are used to designate corresponding parts throughout the several views, and in which:

Figure 1 illustrates a side view of the interior of the pump arranged in accordance with the present invention, a portion of the inner eccentric drum being shown in section; Fig. 2, a view taken at right angles to Fig. 1, also partially in section; Fig. 3 a part sectional view of the controlling valve and valve-body, takenl at right angles to Fig. 2, and Fig. 4, a `transverse section of the valve en broken line m-m, Fig. 2.

in the drawings, numeral 1 designates an outer cylindrical pump casing concentrically fixed upon a rotatable power-shaft 2 by the hub 3, formed on the side wall 4 of the casing, the opposite side wall 5, of the latter being detachably secured in position by the screws 6. Loosely mounted upon the powershaft `within the casing in a non-rotatable cylindrical drum 7, eccentrically arranged both with respect to the shaft and with the casing. Upon the peripheral face of the drum is formed an annular groove or raceway 8, having the opposite side Walls thereof undercut or beveled to' form retaining flanges 9, presenting bearing faces converging outwardly from the axis of the drum. On the inner perimeter of the casing are formed a series of transversely extending lugs 10, pro-` vided with cylindrical grooves or perforations adapted to form pivotal supports engaging the cylindrical outer ends of the blades or wings l1, the said grooves being shaped to allow the blades to oscillate there- 1n and positively to retain the same against displacement. At their opposite or inner ends the blades are provided with similar cylindrical members which pivotally engage corresponding grooves formed in the runners 12, which grooves in like manner to the opposing ones formed in the inner perimeter of the casing, are provided with restrieted side openings, necessitating an end- Wise assemblage of the blades. The opposite side edges of the blades are provided With longitudinal groove in Which are slidably mounted the packing segments 13, outwardly urged by the springsv 14, and arranged to form a close air tight sliding engagement with the opposite interior faces of the side walls of the casing. The runners 12 are formed with concave inner faces and beveled side edges which respectively conform with and engage the convex wallor surface of the raceway 8 and the beveled side faces of the retaining flanges 9 thereof, one of these latter flanges being detachably secured by screws 15 for the assemblage of the runners. 'llhe inner faces of the runners are herein shown as provided with transverse grooves for receiving the packing segments 16, constructed and arranged in a substantially similar manner to the above described segments in the blades, and adapted to provide a close sliding engagement between the runners and the raceway of the drum. As thus arranged the runners are positively retained in position against the displacing action and leakage of the fluid operated upon.

As thus mounted for operation the blades are free to oscillate about their pivotal supports formed on the inner perimeter of the casing, and in the latters rotation, the blades, by means of the pivotally connected runners, vafford a positlve sliding connection on the non-rotatable drum and severally assume titl in their rotation about the latter the various positions shown in the drawing, which latter also lndicates the extremes of said oscillatory movements of the blades and clearly shows the limited sliding engagement of the side edges thereof. In the rotation of the casing about the eccentrically disposed drum, the interior of the casing is divlded by the blades into a series of separated chambers, which severally expand and contract at each revolution and respectively induce suction and compressive forces therein.

Integrally formed with the drum and laterally extending therefrom, is a cylindrical hub 17, and integrally formed with the latter and projecting from the free end thereof is a reduced cylindrical sleeve 18, which together with the hub are concentrically disposed with respect to the casing 1, the sleeve, hub and drum jointly form an elongated bearing loosely mounted upon the rotatable power-shaft 2. The hub 17 projects through the side wall 5 of the casing, and extending longitudinally therethrough are a air of air passages 19 and 20, separated rom each other by the partition wall 21, which latter extends into the drum to form continuations of the separated passages, which lead outwardly through the peripheral wall of the drum and into the raceway 8, where communication is had with the interior of the pump-casing.

A valve-body 22 is detachably xed upon the free end of hub 17 by means of the keys 23, shown in Fig. 1, and on opposite sides of the valve-body, exterior air-ducts 24 and 25 are provided, leading respectively to and from any desired point. Within the valvebody and encircling the sleeve 18, is a rotatable valve 26, provided with ports 27 and 28, which are separated from each other by wings 29 and extend laterally through the opposite peripheral walls for alinement with the ducts 24 and 25 of the valve-body. Upon its inner end adjacent the hub 17, the valve is formed with a seat 30 of extended width, adapted in its movement-to engage and cover the outer end of the partition wall 21 and prevent leakage therebetween. The valve is further provided with a sleeve 31 projecting through the end wall of the valvebody, and upon the latter is detachably secured, by a screw 32, the operating handle 33, having a chambered boss 34, arranged to contain a spring projected latch-pin 35, the inner end of which is adapted to engage a series of holes formed in the end wall of the valve-body. By means of the handle the valve may be rotated and held at any desired point for controlling the flow of air passing through the contained ports 27 and 28. The inner end of the valve is yieldingly seated against the outer end of hub 1 7 by the packing ring 36, disposed in a suitable annular groove formed in the outer end wall of the valve and outwardly projected by the springs 37, the packing ring engaging the end wall of the valve-bod and also serving to prevent the escape o the air therebetween.

The air passages19 and 20, extending through the eccentric drum 7, are shaped to form extended slots or ports at their points of4 communication with the interior of the pump-casing, and these slotted passages are proportloned to accord with the runners 12, which traverse and control the openings thereof for admission and discharge of the air.

In rot-atingthe pump case as an air compressor in the direction indicated by the arrow in Fig. 1, the several blades in the positions shown are expanding and contracting the several chambers as follows:

Chamber 38 has reached its limit of contraction and the pressure therein conforms with that in the outlet passage 20; chamber 39 is beginning to expand and draw in air through the inlet passage 19; chamber 40 has about reached its limit of expansion and the pressure therein conforms with that of the inlet passage 19; chamber 41 is beginning to contractl and the passages leading thereto are closed to allow the air therein tobe partially compressed; and chamber 42 is midway of its compression and is discharging through the outlet passage 20.

At each revolution the successive chambers have corresponding movements and the controlling action of the runners with respect to the passages provides for a closure of the latter adjacent the end ofeach chamber movement to allow the pressure therein to substantially conform with that in the respect-ive passages. The inlet or suction passage 19 leads from the exterior valve duct 24 of the valve-body 22 and through the port 27 of the valve 26, and the outlet passage 20 communicates through the port 28 of the valve and the exterior pressure duct 25 of the valve-body, as indicated in Fig. 3. By a partialrotation of the valve, as shown in full lines in Fig. 4, the discharge from the pump will be divided, a portion thereof returning through the inlet port ,27, thereby reducing the pressure of the air delivered through the outlet duct 25. By suitably adjusting the valve it will be obvious that any desired pressure within the range of the pump may be obtained without disturbing the rotation thereof. It will also be evident, that if the valve be further rotated to the position indicated by the wings in dotted lines, in Fig. 4, the flow of air through the exterior ducts will be reversed without changing the rotative direction of the pump, in which case the suction or inlet port 27 will be supplied through the exterior duct 25 and the discharge port 28 will deliver the compressed air through the duct 24.

Maanen For the rotation of the pump-case, the power-shaft 2 may consist of an ordinary line shaft or a countershaft driven in wellk'nown manner, or the pump shaft may be supported in suitable bearings and rotated by a belt 43 engaging the rim of the case.

The normal rotation of the pump-case provides, in its movement through the surrounding atmosphere, a means for radiating the heat generated by the compression of the air within the pump, thereby tending to keep the latter cool, the cooling action being further increased by the radiator tins or ribs, formed on the outer surface of the case.

When considerable air compression is required, the sliding joint between the side wall 5 of the casing and the fixed outer surface of the valve-body 22 may be provided with suitable packing 45, disposed in an annular recess in the side wall and compressed therein by the ring 46, detachably secured to said wall by the screws 47.

For Xing the central drum 'i' against rotation, the keys 23 in the hub 17 thereof engage keyways formed in the inner surface of the valve-bod 22, which in turn is held 1n fixed position by the exterior ducts 24 and 25, and furthermore maintained against rotation by the arm 48, fixed at yone end to the valve and at its opposite end to any convenient point of support, not shown.

In the operation of the above-described pump, the relative sliding movements of the parts over each otherare comparatively limited, the several blades simply oscillating in short arcs, and the sliding movement over the fixed drum restricted to the relatively small circumference thereof. 1 It will thus be evident that the yielding packing segments forming these joints will be subject to comparatively little wear and will maintain close engagement and serve to prevent leakage under considerable pressure of the fluid operated upon.

While the ump has been described more particularly for compressing air, it will be evident that the same will be equally effective as a suction pump, and may also be used for pumpmg various fluids under pressure, and furthermore the same is equally adapted said shaft, a non-rotatable cylindrical drum eccentrically mounted upon and loosely engaging said shaft within said casing, a series of blades pivotally supported at their outer ends to the inner perimeter of said casing and forming separated chambers therein, means at the inner ends of said blades slidingly lengaging said drum, and inlet and outlet passages adapted by the rotation of said casing to alternately communicate with said separated chambers successively.

2. A pump comprising a rotatable shaft, a Cylindrical casing concentrically fixed on said shaft, a non-rotatable cylindrical drum eccentrically mounted in loose relation upon said shaft within said casing, a series of blades mounted to form expansible and contractible chambers within said casing, and inlet and outlet passages leading through said drum and adapted by the rotation of said casing to alternately communicate with the chambers successively.

3. A pump comprising a rotatable shaft, a cylindrical casing concentrically xed on said shaft, a non-rotatable cylindrical drum eccentrically mounted in loose relation upon said shaft within said Casin a hub formed on said drum concentric wti said shaft and extending through a side wall of said casing, a series of blades mounted to form expansible and contractible chambers within said casing, inlet and outlet passages leading through said drum and hu and adapted by the rotation of said casing to alternately communicate with the chambers successively, a valve-body fixed to said hub and provided with ducts adapted to aline with said inlet and outlet passages, and a valve within said valve-body adapted to reverse the flow from said inlet and outlet passages through said ducts.

Signed at New York, inthe county of New York, and State of Newl York this 22nd day of April A. D. 1916.

l/VlLLlAM BOUGE. 

